Japan Geoscience Union Meeting 2018

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[JJ] Oral

H (Human Geosciences) » H-DS Disaster geosciences

[H-DS11] Geohazards in humid, tectonically active countries and their precursors

Tue. May 22, 2018 3:30 PM - 5:00 PM 201B (2F International Conference Hall, Makuhari Messe)

convener:Masahiro Chigira(Disaster Prevention Research Institute, Kyoto University), Satoru Kojima(Department of Civil Engineering, Gifu University), Hiroshi YAGI(山形大学地域教育文化学部, 共同), Taro Uchida(National Institute for Land and Infrastructure Management), Chairperson:Ohta Takehiro

4:30 PM - 4:45 PM

[HDS11-09] Dammed-lake deposits along the tributary of Kaifu River, southern Tokushima Prefecture, Southwest Japan

*Takeyuki Ueki1 (1.Faculty of Risk and Crisis Management, Chiba Institute of Science)

Keywords:dammed-lake deposits, deep-seated landslide, Pleistocene, Shikoku

Dammed-lake deposits was found along the tributary of Kaifu River, to the west of Murayama, Kaiyo Town, southern Tokushima Prefecture, Southwest Japan. This deposits of more than 2.4 m in thickness is composed of well-lamineted peaty silt and overlain by the modern mudflow deposits. Fossil leaves, nuts and woods showed 14C ages of 6,650 yrs BP. Deep-seated landslide geomorphology is not found now in surrounding valley slopes, but a landslide occurred probably in Early Holocene and dammed up the tributary. Dammed-lake deposits is capable of finding old deep-seated landslides.